JPH0710664U - Manifold type valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] A manifold type valve device in which pilot liquid supplied to a plurality of pilot solenoid valves is filtered by a single filter member so that good operation control of an actuator can be obtained over a long period of time. The purpose is to provide. [Structure] A manifold 1 having a supply passage 5 and a return passage 7 extending in the longitudinal direction and formed therein is provided, and for operating a pilot-operated switching valve stacked on the upper surface inside the manifold 1. The pilot passage 20 for flowing the pilot liquid is provided in communication with the supply passage 5 through the communication hole 21, and the cylindrical filter member 2 is fitted into the communication hole 21.
5 is abutted against the opening surface 24 of the communication hole 21 by the spring member 28, and is provided movably in the communication hole 21 against the spring member 28 by the action force due to the differential pressure generated in the front and rear passages thereof. A bypass passage 29 for the pilot liquid is formed with the side surface 30 of the filter member 25 that moves in the communication hole 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manifold type valve device in which pilot-operated switching valves are stacked and arranged in a stacking portion having a manifold, and a pilot solenoid valve for pilot-operating this switching valve is separately installed in a manifold.

[0002]

[Prior art]

 Conventionally, a manifold type valve device of this type is described in Japanese Utility Model Laid-Open No. 127875/1990, particularly in FIG. This product has a pilot-operated switching valve stacked in a stacking part on the top surface of a manifold that has a supply passage and a return passage for the working liquid inside, and a pilot solenoid valve separately installed in this manifold to connect the supply passage. A part of the flowing working liquid is used as a pilot liquid to pilot-operate the switching valve so as to obtain the operation control of the actuator.

[0003]

[Problems to be solved by the device]

 However, in this configuration, the pilot liquid that operates the switching valve is provided for each pilot solenoid valve so as to flow directly from the supply passage, and foreign matter is easily mixed in the operation liquid that flows through this supply passage due to the operation of the actuator. Also, since the pilot solenoid valve has a small amount of control, it is installed in a small size.Therefore, when the valve device is installed in a place where the working environment is poor, the pilot solenoid valve may malfunction due to foreign matter mixed in the pilot liquid. It happened frequently. For this reason, the applicant of the present invention has disclosed in each pilot passage through which a part of the working liquid from the supply passage flows as pilot liquid to each pilot solenoid valve as shown in FIG. 1 of JP-B-44-2926. , A filter member and an on-off valve that opens when the filter member is clogged are installed in parallel to filter foreign matter in the pilot liquid with the filter member, and if the foreign matter clogs the filter member, it opens and closes. I tried to deal with the shortage of pilot liquid by opening the valve. However, with this configuration, the number of parts is large, so the manufacturing cost rises, and as the filter member becomes clogged and the differential pressure increases, the movement amount of the on-off valve increases based on the acting force due to this differential pressure. As a result, the opening area of the valve was increased, and foreign matter of a size larger than the allowable value entered the pilot solenoid valve, which was not satisfactory.

The present invention solves such a problem, and a single filter member filters the pilot liquid to be supplied to a plurality of pilot solenoid valves, so that good actuator operation control can be performed for a long period of time. The purpose of the present invention is to provide a manifold type valve device that can be obtained over a period of time.

[0005]

[Means for Solving the Problems]

 Therefore, according to the present invention, a supply passage connected to the pressure source and a return passage connected to the storage tank are formed in the inside by extending in the longitudinal direction, and the supply passage and the return passage are respectively connected to the supply passage and the return passage. The manifold has multiple manifolds on the upper surface that are separated from each other in the longitudinal direction by opening the load path and the pilot path that are connected to the load path connected to the actuator and the pilot path. In addition to installing the switching valve in a stack, a pilot solenoid valve for piloting this switching valve is installed separately in the stacking part and provided in the manifold, and pilot passages for flowing the pilot liquid for operating the switching valve are provided in each stacking part. Is formed inside the manifold by extending in the longitudinal direction so that the pilot passage and the pilot solenoid valve communicate with each other. A cylindrical filter member is movably fitted in a communication hole formed in the shield, and one end surface of this filter member is brought into contact with the opening surface of the supply passage opening by a spring member in the communication hole. Between the supply passage and the pilot passage, the movable member is provided so as to be movable against the spring force of the spring member by the acting force due to the differential pressure generated in the front and rear passages, and the communication hole and the side surface of the filter member inserted into the communication hole are provided. It forms a bypass route that connects the two.

[0006]

[Action]

 In such a configuration of the present invention, the pilot liquid is filtered by a single filter member provided in the communication hole that communicates between the supply passage and the pilot passage, and the pilot solenoid valve and the switching valve are filled with foreign matter. Occurrence of malfunction due to is prevented and it works well. When the filter member becomes clogged and the acting force due to the differential pressure generated in the front and rear passages of the filter member becomes larger than the spring force of the spring member that presses the one end surface of the filter member against the opening surface of the communication hole, the filter member becomes It moves in the communication hole in the direction against the spring force of the spring member and moves away from the opening surface of the communication hole. At this time, the insufficient amount of the pilot liquid due to the clogging of the filter member flows into the pilot passage through the bypass passage formed between the communication hole and the side surface of the filter member. Even if the pressure difference is further increased and the filter member is further separated from the opening surface of the communication hole, the cross-sectional area of the bypass passage can be maintained as it is. Therefore, good operation control of the actuator can be obtained for a long period of time without being mixed in with.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 denotes a manifold, which is a main feature of the valve device, in which a ridge 2 is formed in the upper part along the longitudinal direction, and a cross-sectional shape which is orthogonal to the longitudinal direction together with a wide part 3 below the ridge. Has a convex shape. In the wide portion 3 of the manifold 1, a supply passage 5 connected to the pressure source 4 and a return passage 7 connected to the storage tank 6 are formed in the inside by extending in the longitudinal direction, and are provided to the actuator 8 side. A plurality of load passages 9A, 9B, ... Connected to each other are formed in the inside by opening on the side surface along the longitudinal direction. Reference numeral 10 denotes a laminated portion formed on the upper surface of the raised portion 2 of the manifold 1, and includes a supply passage 11, a return passage 12, load passages 13A and 13B, and a pilot passage which communicate with the supply passage 5 and the return passage 7 and the load passages 9A and 9B, respectively. 14 and 14 are provided so as to be open, and three are provided at a distance in the longitudinal direction of the manifold 1. In this stacking portion 10, a pilot operated switching valve 15 is located at the uppermost stage, and valves such as a flow control valve with a check valve 16 are appropriately stacked and provided so as to constitute an operating circuit of the actuator 8.

Reference numerals 17 A and 17 B denote pilot solenoid valves for pilot-operating the switching valve 15, which are separately installed on the side surface of the raised portion 2 of the manifold 1 in pairs with respect to the laminated portion 10, respectively. The spool 19 is axially moved by non-excitation to supply the pilot liquid to the pilot chamber side of the switching valve 15 and to discharge the liquid in the pilot chamber of the switching valve 15 to the storage tank 6 side. Reference numeral 20 denotes a pilot passage for flowing the pilot liquid, which is formed inside the manifold 1 so as to extend in the longitudinal direction so as to communicate with the pilot passage 14 of each laminated portion 10 via pilot solenoid valves 17A and 17B. ing.

Reference numeral 21 is a communication hole that connects the supply passage 5 and the pilot passage 20. A large-diameter hole 22 and a small-diameter hole 23 that follow the large-diameter hole 22 are formed from the raised portion 2 of the manifold 1 toward the widened portion 3, The pilot hole 20 is provided on the inner peripheral surface of the diameter hole portion 22 so as to open, and the small diameter hole portion 23 has an opening surface 24 on the bottom surface for opening the supply passage 5. Reference numeral 25 denotes a cylindrical filter member formed of sintered metal, which is movably fitted in the communication hole 21 to filter foreign matter in the pilot liquid diverted from the working liquid flowing through the supply passage 5. Reference numeral 26 denotes a plug member, which is detachably screwed from the raised portion 2 side of the manifold 1 of the communication hole 21, and one end surface 27 of the filter member 25 is provided by a spring member 28 so as to abut the opening surface 24 of the communication hole 21. ing. The filter member 25 is movable in the communication hole 21 against the spring force of the spring member 28 by the acting force of the differential pressure generated between the front and rear passages, that is, the supply passage 5 and the pilot passage 20. . Reference numeral 29 is a bypass passage for passing the pilot liquid that is insufficient due to clogging of the filter member 25, and is fitted into the small diameter hole portion 23 of the communication hole 21 and the small diameter hole portion 23, as shown in detail in FIG. It is formed in an annular shape between the side surface 30 of the filter member 25 and one end surface 27 of the filter member 25 is provided so as to be opened and closed by coming into contact with or leaving the opening surface 24 of the communication hole 21. 31 is a connector member for electrically connecting the solenoids 18 of the pilot solenoid valves 17A and 17B, 32 is a terminal box, which is installed on the upper surface of the manifold with a built-in terminal block for connecting the solenoid 18 and wiring from the power supply side. ing.

Next, the operation of this configuration will be described. In the illustrated state in which the solenoid 18 is not excited, the pilot solenoid valves 17A and 17B communicate with the storage chamber 6 through the pilot passage 14 and the return passage 12 on the pilot chamber side of the switching valve 15, and the actuator 8 switches the switching valve. The working liquid in the supply flow path 5 flows into the right working chamber in the figure via 15 and stops at the starting end.

From this state, when the solenoid 18 of the pilot solenoid valve 17B in the first laminated portion 10, that is, the left end laminated portion of FIG. 1 is excited to move the spool 19, the pilot liquid in the pilot passage 20 is removed. It is supplied to the switching valve 15 via the pilot passage 14, and the switching valve 15 is pilot operated to the right switching position so as to switch the flow direction of the working liquid, and the actuator 8 is moved forward. Then, when the solenoid 18 of the pilot solenoid valve 17B is de-excited, the spool 19 of the pilot solenoid valve 17B returns to its original position and the pilot chamber side of the switching valve 15 is switched to the storage tank 6 side for communication. The switching valve 15 is held in the operating position by the built-in detent mechanism, and the actuator 8 continues to operate at the forward end. In order to return the actuator 8, the pilot solenoid valve 17A is operated to supply the pilot liquid to the switching valve 15 and the pilot is operated to the left switching position, and the actuator 8 is returned to its original position. Further, the pilot operation of the switching valve 15 for the adjacent second laminated portion 10 can be operated by performing the same pilot operation.

In this operation, the pilot liquid in the pilot passage 20 is filtered by foreign substances mixed by the filter member 21 when flowing in from the supply passage 5, and the pilot solenoid valves 17A and 17B and the switching valve 15 are erroneously caused by foreign substances. Occurrence of operation is blocked and it works well. Then, when the filter member 25 is clogged with the filtered foreign matter and the acting force due to the differential pressure generated in the front and rear passages becomes larger than the spring force of the spring member 28, the filter member 25 moves in the communication hole 21 as shown in FIG. The spring member 28 moves in the direction against the spring force, and the one end face 27 is separated from the opening face 24. At this time, the pilot liquid flowing from the supply passage 5 flows into the pilot passage 20 through the bypass passage 29 due to insufficient opening due to the opening of the bypass passage 29 and clogging of the filter member 25. Further, when the differential pressure is further increased due to the operation of the valve device and the filter member 25 is further separated from the opening surface 24, the detour passage 29 has the same cross-sectional area as that of the detour passage 29. Can be prevented from being mixed into the pilot passage 20, so that good operation control of the actuator 8 can be obtained for a long period of time.

Further, the filter member 25 is provided movably in the communication hole 21 against the spring force of the spring member 28 by the acting force due to the differential pressure generated in the front and rear passages, and the communication hole 21 and the inside of the communication hole 21 are provided. Since the bypass passage 20 that connects the supply passage 5 and the pilot passage 20 is formed between the filter member 25 and the side surface of the filter member 25 that is inserted into the filter member 25, clogging of the filter member 25 progresses and the filter member 25 becomes a spring. When the member 28 is moved in the direction away from the opening surface 24 against the spring force of the member 28, foreign matter can be filtered by the fitting and inserting portion of the filter member 25 forming the bypass passage 20 and the good operation control of the actuator 8 can be performed. It can be obtained over a longer period of time. Further, since the bypass passage 20 is opened and closed by one end surface of the filter member 25 coming into contact with and leaving the opening surface 24 of the communication hole 21, the opening and closing for opening and closing the filter member and the bypass passage as in the conventional case. The number of parts can be reduced compared to the case where valves are installed side by side, and the valves can be integrated into a small size, so that they can be easily installed on the manifold and the manufacturing cost of the valve device can be reduced. In the embodiment of the present invention, the bypass passage is formed in an annular shape by the communication hole 21 and the side surface of the filter member 25. However, the side surface of the filter member, that is, the outer circumference is polygonal, or the side surface of the filter member is recessed in the axial direction. It is needless to say that the same action and effect can be obtained even if the bypass passage is formed by providing the above.

[0014]

[Effect of device]

 As described above, according to the present invention, the supply passage connected to the pressure source and the return passage connected to the storage tank are formed in the inside by extending in the longitudinal direction, and the supply passage and the return passage are respectively connected to the supply passage and the return passage. The return path and the load path that connects to the actuator side have manifolds that are provided on the upper surface of the stack. In addition to the stacking of switching valves, a pilot solenoid valve for piloting this switching valve is separately installed on the stacking part and installed in the manifold, and pilot passages for flowing pilot liquid for operating the switching valves are stacked in each stacking. Is formed inside the manifold by extending in the longitudinal direction so as to communicate with the pilot passage of the section through the pilot solenoid valve, and connects the supply passage and the pilot passage. A cylindrical filter member is movably inserted into a communication hole formed in the manifold, and one end surface of the filter member is abutted by a spring member on the opening surface where the supply passage opens in the communication hole. The movable member is provided so as to be movable against the spring force of the spring member by the acting force due to the differential pressure generated in the front and rear passages of the member, and the supply passage and the pilot passage are formed by the communication hole and the side surface of the filter member fitted into the communication hole. By forming the bypass passage that communicates with each other, the pilot liquid supplied to the multiple pilot solenoid valves can be filtered by a single filter member, and good operation control of the actuator can be obtained for a long period of time.

Further, the filter member is movably fitted and inserted in the communication hole against the spring force of the spring member by the action force due to the differential pressure generated in the front and rear passages thereof, and the clogging of the filter member progresses. When one end surface of the filter member moves away from the opening surface of the communication hole, foreign matter can be filtered by the fitting portion that formed the bypass passage of the filter member, which further improves the actuator operation control. Can be obtained over a long period of time.

Further, since one end surface of the filter member is provided to abut on the opening surface of the communication hole through which the supply passage opens with a ridge member so as to open and close the bypass passage, it is possible to open and close the bypass member as in the conventional case. The number of parts can be reduced compared to the case where the valve is installed side by side, and it can be installed in a manifold easily because it can be integrated into a small size, and the manufacturing cost of the valve device can be reduced.

[Brief description of drawings]

FIG. 1 is an operation circuit diagram showing an embodiment of the present invention with a part thereof omitted.

FIG. 2 is a front view of a valve device according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line EE of FIG.

4 is a cross-sectional view taken along the line DD of FIG.

5 is an enlarged view of a main part showing an operating state of the filter member of FIG.

[Explanation of symbols]

 1 Manifold 4 Pressure Source 5 Supply Passage 6 Storage Tank 7 Return Passage 8 Actuator 9A, 9B Load Passage 10 Laminated Part 11 Supply Passage 12 Return Passage 13A, 13B Load Passage 14 Pilot Passage 15 Switching Valve 17A, 17B Pilot Solenoid Valve 20 Pilot Passage 21 Communication hole 24 Opening surface 25 Filter member 27 One end surface of filter member 28 Spring member 29 Detour passage 30 Side surface of filter member

Claims (1)

[Scope of utility model registration request] 1. A supply passage connected to a pressure source and a return passage connected to a storage tank are formed in the inside by extending in the longitudinal direction, and the supply passage and the return passage are connected to the supply passage and the return passage, respectively, and an actuator. The load passage connected to the side has a manifold that has a plurality of laminated portions that open a communication path and a pilot passage and that are separated from each other in the longitudinal direction and that is provided on the upper surface. A pilot operated switching valve is laminated in the laminated portion of the manifold. In addition to installing the pilot solenoid valve for pilot operation of this switching valve separately on the stacking part, it is installed on the manifold, and the pilot passage for flowing the pilot liquid for operating the switching valve is provided with the pilot passage of each stacking part and the pilot solenoid valve. It is formed in the manifold by extending in the longitudinal direction so as to communicate with the valve, and the manifold is drilled so as to connect the supply passage and the pilot passage. A tubular filter member is movably fitted in the communication hole provided, and one end surface of this filter member is brought into contact with the opening surface of the supply passage opening by a spring member in the front and rear passages of the filter member. It is provided so as to be movable against the spring force of the spring member by the acting force due to the generated differential pressure,
A manifold type valve device comprising a communication passage and a side surface of a filter member fitted into the communication hole to form a bypass passage communicating between the supply passage and the pilot passage.